Hey, just wanted to let you know this should be fixed now!
There are a few moving parts here: instances have a list of all languages it knows about, admins can restrict what can be used on the site (“discussion languages”), and communities can further restrict what languages they allow (if no mods speak Swedish, no use allowing it because you can’t moderate it), and on top of that you can select which languages you use in Lemmy’s settings. Alexandrite now respects all these settings/restrictions.
Some communities only allow posting in “Undetermined”, and Alexandrite defaults to selecting “English”, so if it was in one of those communities that’s why you were having issues. Should be good now though.
Or find and replace all the periods with ones that are slightly larger font.